The floor location effect in the damage detection process is discussed on a 3 storey frame, which is compared to a
numerical simulated vertical cantilever beam to illustrate the results. It is concluded that the effect of the floor location is
insignificant on the frequency trend while the damage ratio varying, and it is significant while the damage location
varying. The effect of the floor location is less while the damage locates nearer the floor location. The basic trend still
exists while the damage location varying in the further investigation, but it may be covered by the local waves in the
general illustrations. It is considered that the effect would be more significant to the unsupervised methods.
The design of security protocols is difficult and extremely complicated. In this paper, we presents a framework for modeling security protocol, UML extension for security protocol (USP), which makes it possible to the development of security protocols in an intuitive and visual way. For further security analysis of USP model, we refer to a precisely defined semantics of behavioral aspects. The formal semantics of a simplified fragment of UML builds on dynamic semantics of UML State Machines. As a case study, Denning-Sacco protocol will be described with USP. Moreover, the security protocol described with USP can be converted to an implementation or connected with existing formal analysis framework if appropriate converter tools are available.
IPSec (IP Security) provides a standard, robust, and extensible mechanism in which to provide security to IP and upper-layer protocols. But the encryption and message authentication services provided by IPsec require significant computation time. Consequently, IPsec can degrade performance obviously. The paper presents a parallel hardware structure of high performance IPSec VPN gateway to speed up the IPSec packets process, and introduces the IPSec software design in detail includes modified FreeS/WAN IPSec implementation and extended Internet Key Exchange protocol. The result of network performance test proves that the structure can fulfill the need of gigabit fast network. The paper also proposes multiple small packets assembling algorithm which is used to accelerate small packets process. The algorithm significantly improves the performance of small packets.
The wide use of network improves security risks, but the traditional network security tools are single-functional and they are difficult to extend and manage. These security tools can’t fulfill the need of users. The paper presents a network security oriented language: NSL (Network Security Language). The language provides a common abstract layer of all kinds of security application. It can be used to construct multifunctional, distributed and extendable security applications, satisfying various and emergent security requirements. The paper describes its network oriented structures, features and three security mechanisms. The NSL interpreter implementation is also analyzed by the performance test. At last, the paper puts forward improving work which will be done in the future.